#include<stdio.h>
int main()
{
	int n,k=0;
	scanf("%d",&n);
	while(n!=1)
	{
		if(n%2==0)
			n/=2;
		else
			n=(3*n+1)/2;
		k++;
	}
	printf("%d\n",k);
	return 0;
}
